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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf2e6d2e756e019fc4f4ba10c6148b5f33b64bcc93125c59a1819992f1db0f55' 
  AND token = 'zsJuvZ5HsP4fkRPNKuOaW5FxPtpQYTiCV8J7JebwMPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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