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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23615be4d2b2ae5ac2c9b4464ee2940ca7cd9d5b462e117a74af3109c4e0b00b' 
  AND token = 'lKxIvZbcu5jmwBFT4/3HgZCU7SrQLPrnFRm3q9zKSXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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