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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1391b01f1d21d24a89a6cd9930ccd2e37d895a341a540adf105f2bb3ff75b72b' 
  AND token = '8cyIzogwGlxM1K9HZTqUM55sdmNS+S3m0cs+CG7Vep0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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