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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17d548c9971423f0d3690d2368b72082bacbb89732faf1c3a2f8e8e7499b107' 
  AND token = '2hoBn99Q7i+g7euyuk1+ZwAsXOjcKfpkvebmBLu2HCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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