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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c0ffa4ceb46e310c003839c64b2466175c9c72d10510ac960bddeb69a68019' 
  AND token = 'Vk17Rw5m6e1QYjV5jdotqeGCWBWz5fbStunEL6T/8aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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