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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1ee83d7b926d8664604383e33487da6bf9f539352b8db87746f9ba2b0641c5' 
  AND token = 'N/jYcfIYz5ordDGXLYHRnU8exjkbx4rEN2ioIYG2k5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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