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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bda718ca56b35de9015b9b7f9491b10e2d459ce5682a0939d722bf1ce03cc72' 
  AND token = 'kVmVEk85V+GJ+nvlPW2qIiY1O/b/knbCOqJPRmEK3F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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