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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8662adfad95b4bbc6137048671494106e62c2e895a33f927f511aa607c8525f' 
  AND token = 'pP89mIq7hb6tAAPI5M3M9BWO3/VgiiwUka94BR2FNIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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