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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364bff31e076147b0f8c9f4a0a9345ac5b91533055a4556f489542b4243571e6' 
  AND token = 'arn6VkGKB9sGr0lXAJfRVCwKm5y4meo3e+9I9Iy1AaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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