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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368e18ea2c3f7f15cb10e7d5b89d825b1f43d7b0086838878cfdee6e8f5e8aa2' 
  AND token = 'l1bvzRX8uAqcM2p1fZSY4mxQAUrzUrZQQtkRxlYqYxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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