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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9626e180dda9d11908e0200f1c95b40ec45c0ae85603e3ff7e4918deecdc395' 
  AND token = 'hVnUplJ9prn9ckU8D7eqgX3qhYw1h9+zWf1k5Dx38tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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