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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938cc93ed0bfad937925cad73d96dcf3ddd2fd89fc3236870271901e71ed2911' 
  AND token = 'sKPJcn1w7grEkrclqoKEXio/xm6yo28y7iMgoiRx8hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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