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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e4dc0cc55d5d73749168f599e15eb29d0b4686c33259c591217c9cf9cae7de' 
  AND token = 'TrciDCSDOWmDs8/bmTF7gkMVAnEY+NrXrMSzu3mJ2f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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