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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e97e4ffe05abde8e713dcab784ae62bb2c4aa05d04f78f3d7b209478c52698' 
  AND token = 'w3fEny0eJgda+KAuPvZvFys8ls7jyYxOPQTZdYuKaEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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