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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c264065bf56cbec77e7a6267c9c1bf9a472890d40042614fe1ae60f5e144602' 
  AND token = 'g8BLKSXkqSLjyCCZLGoP58lSWB/WrF+M/v0Lv6Xp7hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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