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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955fa7d0b1ebd5f4be46fbbe4e443aff25532190556f5b1196ff03aac0c6619d' 
  AND token = 'op05vDKPOuzT5ErV+/bdR9SMjVy1xZL0Jh1WjE7L0Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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