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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2c2954cf8e208589ee6d557e18f6ae755540d34a01e0f52146da109d0e1707' 
  AND token = 'HRDjjN++yNrvb8o2584GjZCjaRL5CXrvkYPcjtWgT60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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