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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799887e71f06325d80963ff5a7c1ce159a970c6781ee8b2b59779ab2e0469f85' 
  AND token = 'fKP53zJSJss9WTmV+ZLL4mktp+bnBC4ozg0N7y41+ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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