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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e665f15c20df9e7e7153d97b2ae4988e6090ea261b388427429c11ebf90e9dac' 
  AND token = 'fh9g+p2a+iN2W8BI/0bYOxHa0C4hqRqU3qi4+JByuuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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