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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '480884e9b61f434bfd23e38978fb24c0dacdd034d028b99b43e6cfa2134b2107' 
  AND token = 'y+9TA1FXNmHx/1AHCcNNxUTsIlj3LX1Kdr8NDHAB5Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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