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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbeec1e9228fade65bd7befe313450c4ad2817cad316688ea4b06fd02036fe86' 
  AND token = 'lCmJEWsXgniy+YBcG8llICg+hxA9/Hg42o9Rw1y3gAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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