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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d67da3aa89cebc6ee54c7ad1e075e1d1efc8fb1d42494d8a78c8428201d2972' 
  AND token = '4fhtkdMihD/EV+E08dRsHCtU+ypesnF5Jm0UpgkXPBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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