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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe24e32a9cb9ac79015d42c82ca3f4ff5a83bcccfd7d9b29ceec9698325df52' 
  AND token = '0ut7u/lgmjdAu2IDb4IG3W72SSp8Ed0ZePt24Vf6/88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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