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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f3528e7d11cbd1ed2381cbb4c52720e9dd2ae53d8501dc0b96c749901b7d3fe' 
  AND token = 'HSvXAhRyVt0mosGO6SLUSA7HOMuZnG3qpdV0ovINim4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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