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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcde0bd5b6663c86480625c20750e4f8e12f9301db3fdd6d8060dc9cf3fdf55' 
  AND token = 'n5WzN41PstyrxyvlBBsQSHtOJXC6LAcPJXWg8RmnRVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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