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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72be70abfa761f5cb203ef2d9539f829e42ec770519d3f905671857b4c8fa10b' 
  AND token = 'cOcsrIpedVYssXNdoJELaO9O5beaTI6O5AayYyP6lM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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