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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a2208fcb7f4a68bb51a7fa886f3fa5c98e70bd203e55d518297d064ff0de09' 
  AND token = 'xHafclBNqHDiDlJiYgBCrg2FxnIpgVRoeXM+3S9v8JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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