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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562f2f232991fc8337a953ae6eb2bb360535b9abe32af0d019aaa0552946e7a2' 
  AND token = 'oPG936SkCRGOt64t+zgBCs8HIp86h+icfxXPIYXe+U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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