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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474ce0e5c205d8c77c6bd064b59e3c87d65fda20b0c69b75ad7d4ea100d9b8c8' 
  AND token = 'Sdo5MCvT0mUJlwFu9xH/wqR5HrbLjHSq2GuT1o9Ogqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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