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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '769e06297aeb9d9f958439c8d2ae69d5a5af74ede3ee2cd5658dfca6134fe65a' 
  AND token = 'kqgjFr0hvAGiUpB4lPAcmI9nQ5pE7dnquuW2D2xrl0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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