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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '172a6caae2835df06f3b4d1d86f0cc57be2b25d09197d6810673617d731582f6' 
  AND token = '1whcLAZH0UlzdW7enqkLWHdOI7NU8j12Xwgp3fcptO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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