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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1767d465ffe5d95ae98c25883074cdd036ab8c2ba49a151b673a41a366905c03' 
  AND token = 'vKE6w4WWKXEbEU1pYDemOq0/cKk40NJjiKYjFIEESH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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