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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6412efb0d3f3ef04e1c2d503b8e5e8256dc285d3af51eb2defc6c0ad19f0e2da' 
  AND token = 'NzS6rmDfpn9QXzjHL2w+uaMLDOCuhqaUpxlGUyKrkEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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