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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c390806eb2fedde26daf550d4dc1a153eb97cbaaf4e4eb27415b4f88b77e8dc' 
  AND token = 't+hq8fLpEGJiOfSSHbFSaFgeo3Y1P4oBOjPtYYT1tJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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