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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ba92a13f0d31a6dccb719d1c84692866f3d8ccda333ad4e934665615176b17' 
  AND token = 'kcpOzyISJnmA/iweGmZaxG3ZteEKTMrOpuKFMDVhOE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}