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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '298b98194a851d37458ce4037fd5f501a10a7755a32e6f7c62764216f730622a' 
  AND token = 'FWSxuanvhtW44gkQuy+NwfvHKDECpypKnoasdbalyjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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