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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f712c28e2aad37c8a27655c4fd2cbde72f7d9c978ade3af38111bbb0416322' 
  AND token = '5Q6OqE7YpVLFE6bXAh+upuLukBAJL25b0o6jNZy3WWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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