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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9cafb2d1f4aeaa6d69a657e9e414b6aa61fdc95594a3265fb8a7008ef7f53b' 
  AND token = 'x3LiMiJPT9eNe50y0c8W4AXtA2U57j57zIg9cqdlEEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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