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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e591f2d0587efd214598857c63604f9f413edc6ce24ae8e5c37aeb7b3b1afc' 
  AND token = '6a7x1zPEs1DfMO0mnMg7i2vErjmILn/Fhsyif7MNFSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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