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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9bafa7e98e08d6ffef726f0b341071ef23c24fd117b2b464f3b54cf32ff82d3' 
  AND token = 'Zxno9wQNiJSqeaBvg+fhOXqNKd1BkMyHIe7v+V05+uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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