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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e8ba147051009e30b29165092f6f48c347dbc2ed53f5ab529e3f4e534adb71' 
  AND token = 'oyz73u3sCeVT3uZRzNcEF9Z+wd0EMIUjGxg0xzroEZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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