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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20bfb4023ce170356b88cadba9afd7e184da5cc0cf45e23ed859d5a35b97da94' 
  AND token = 'KfnJiO9TXxMA9taP77fyRQ0IGs7prqMy5hpfgbmZZSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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