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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13db8c851ab69f5ca555c7c3effbfae8dd6374ac9def1888ec7a90ea69eb3969' 
  AND token = 'XCFjPOiQMtBeHC21OxYUvJR+iClR1dZfuiS3MgPm8x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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