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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c53ef2cb8e81ae151477681f0a92211779117b28f0680ca2043872beb43a8a3' 
  AND token = 'fF73dinUczdcTu6q/fNTnd/3SPVz66Ivzda3rFFYWus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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