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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78f4fe8ccf3c90efdf71594bb16a7625f8a7c65a6a3ca69bbf38d4d0de05bf2b' 
  AND token = 'DIS8gXz0rycee3sVi15LTWsGXH+HQHa+MlYkRXHYQiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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