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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61a43873763ea0979f9cad93a87b66ae328a75c56c4b1015f151121e67fd6dc5' 
  AND token = 'ZszufmKys3ud41qw1T+p/bucjfO9nNe4Ya20Edmd1lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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