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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36567e5015a3e56cf2946d1f4e707999c0d5ad8f93efec137ea9c398fb6e89e8' 
  AND token = 'DVmwIm+hm3pYeNddOPNNG3v1pxWwAFw2KO88xfbHoE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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