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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d4ee4cb2ebf42db2b5a657d2b8e4c943817c752ddb25c2d5b391741eb6effc' 
  AND token = 'fwL85ryrBNNLym57iz8aiIU0+yzZ0583ydNM62IMS+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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