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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa9d8c08471fd9a7eee17832154f8beb20d4646cc63bab9bc378948410d4e20' 
  AND token = 'vsKtd8PeByhb5rorbSmcoCcnV0JF/Qw+ZHySh0sNe9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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