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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f195b9e03ce9240b304f7e324ea8368a5a9beb646a56c54cde705595bbecc7' 
  AND token = '87yI6ZcPfu7XK9K5Tq9cAgCxjFvq31iscUf4qLzswvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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