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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ee40308d72e66656f36940a3164db94d0dfde852387b96d3f48fa1686882fa' 
  AND token = '1muQE9Vw+j+P04n3AC8yeFTKDPS5aeI9tIhnmQfIROo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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