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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5107e8eef3d2051d9645984b5e1ee090336164443ffbe49f5f9678f0efab76f' 
  AND token = 'Ylbffl6qWpAM9ZPTv+R8jrVYh8xKCkLVFmxXTsBkFK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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