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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8233ea357d35e7bbfdbc595420a7496d584365db57ce645cdb54233d5601ca57' 
  AND token = '1iL4SR1CDF3VvOPE5d5sr5IGOgf4Fl21shO22Szj8no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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