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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5be4b9cb49d1a0f7e80aaef523cf1b00f149ecf0a503e76bf4370a077088be' 
  AND token = '6RGH85C8nkmE/D/XGj4WX3yyzJYh41PK/2P+VmB29N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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