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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c53ab5a703ad8e0e05cc6b7cc3d31e96b04bfc26e4b48721a72af315de053000' 
  AND token = '7fgc3IwSsOIqACgGY8S70CMnfi09O+rmfoVRr3opvpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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