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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba31e3a49f8dfd68404fb46c96a7ef33cb933df52009a7fa9144a16397a04cb9' 
  AND token = 'yIcVo3pgpYeVTWztv3wGSefl04Z1/LO1w5B6hstKrTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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