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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f598a9c070345532ab9551a85fb442bd5fb04dfede89418dba9ca35f987b1ef' 
  AND token = 'WOCGPPJpgLdVfNq1SP5AgKIzd8n2GA0p3aMz7Qs645s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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