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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eedfcd2ac8547cd661fa934bf8acc4aa66ceb6ea9260ddbabfde1cacad0f82b' 
  AND token = 'WV4VD1/s/GCrv/iaHluH5jt1QkWi22mFldF9bLQI8KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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