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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7f9158ff4f728337935e211ac2a188c8b402e7ce133db0f5c8246988fab7d8' 
  AND token = 'qcn7Mqwjdx741QEvqM7KKkQQUYOWkNgPqBwtUheVzp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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