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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7942d5a551bd3274520836ee2b72533073c46f5ed23dfb22b6e58cfe403dcb17' 
  AND token = 'jxU1QI1WN4t3tCvIPzU6jCIydaVdn0FCCRXfEXtkj14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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