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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ae3220c91cea805762d47813a4559492b12ce06139738e113f8a205406a5a9' 
  AND token = 'nqWqwZESRfHzm+vXK0WyBunqbjFg7i9gl5727EA0YO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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